What caused the bacterial infection to occur?
There are several potential factors that may have contributed to the bacterial infection in the mullet. First, there may have been a very low level, but inactive, Streptococcus infection in the wild fish that suddenly became virulent. Many organisms, including humans, frequently have low-level infections of Streptococcus for long periods without showing any outward signs. Alternatively, the bacterial species may have been introduced to the environment. Sources of potential introduction may have been from sewage, contaminated feed used in aquaculture facilities, or other sources. Why were mullet affected so significantly by the Streptococcus and not other fish? Different species of fish have a different level of susceptibility to infection. Laboratory studies have shown that the same level of infection can kill some species, while others remain unaffected. Furthermore, fish of different year classes (sizes) may have a different level of susceptibility to infection and immune response to
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